The Field Card
A number with
no method is
a slogan.
Every spec on this site was measured here, not copied off a supplier sheet. One scale, one protocol, one set of numbers — printed on a Field Card in the box with the date it was measured and the initials of whoever measured it. Where a number is missing from a listing, it is missing because we have not measured it yet.
CALIBRATED
Field Card
Wind Shirt 42
CAL-SHL-W42
- Weight, garment
- 138 g / 4.9 oz
- Fabric weight
- 42 g/m²
- Air permeability
- 4.1 CFM
- Fabric noise
- 33 dB
- Packed volume
- 0.4 L
MEASURED 2026-07-05
A&D EK-6100I, ±1 G
BY D.L.
One of these is in every box
The card carries the same values the product page carries, the date they were taken, the instrument they were taken on, and the initials of the person who took them. It exists so that the page and the carton can never disagree — and so that if they ever do, you have the evidence in your hand rather than our word for it.
It is also an invitation. Put the pack on a scale. If your reading is outside the tolerance printed on the card, email us and we will re-measure the run and correct the page. That has happened twice. Both corrections stayed up.
What the card is not is a certificate of quality. It says what something weighs, not whether you will like it. That part is what the “not for” block on every product page is for.
The protocols
Five ways of measuring, published in full
01
Weight
A&D EK-6100i bench scale, ±1 g
Everything is weighed as it is sold: straps fitted, hardware attached, nothing removed. Clothing is weighed in size large, footwear accessories in US 10–11, and the size is always stated next to the figure.
We do not weigh a sample stripped of its belt and call it a pack weight. Where a system has parts that come off — the Ridge Frame's bag, a gaiter's instep straps — the total and the parts are both published.
02
Fabric noise
Class 2 sound level meter, A-weighted, 300 mm
A gloved hand brushed across the face fabric at 300 mm from the microphone, in a room with an ambient floor of 22 dB, averaged over ten passes. The ambient figure is published with every reading because a noise number without one is meaningless.
This is a comparative measure, not an absolute one. It tells you the Wind Shirt 42 is quieter than the Rain Shell 20K by eleven decibels. It does not tell you what a deer hears at forty yards, and we will not pretend it does.
03
Waterproofing
ISO 811 hydrostatic head, third-party laboratory
Hydrostatic head is measured to ISO 811 by an independent laboratory, per production lot rather than once at development. The certificate number for your lot is printed on the Field Card in the box.
Breathability is JIS L1099 B-1. Dry bags and liners are tested differently — by submersion, with the depth and duration published, because a roll-top has no hydrostatic head to speak of.
04
Light and power
Integrating sphere to ANSI FL1; West Mountain CBA IV load tester
Lumens are measured at 30 seconds from switch-on, and runtime is measured to 10% of initial output — the point at which a lamp stops being useful — rather than to the point it goes dark.
Power banks are load-tested for delivered capacity, warm and cold-soaked at −10°C for four hours. Cell capacity is what a manufacturer prints; delivered capacity is what you actually get, and the cold figure is what you should plan a December hunt around.
05
Load and certification
Third-party testing to ASTM F2949
Saddles, platforms, sticks, tethers and lineman's ropes are certified as assemblies by a third party to ASTM F2949, with the components they ship with. The certificate number is printed on the Field Card and on a sewn label inside the product.
Pack load figures are different and we word them differently: the number published is the load we carried in testing, not a rated maximum and not a failure point. It is the load we stopped adding at.
The limits
What we will not put a number on
Scent control.There is no published, independent evidence that carbon in a garment or a storage bag defeats a deer’s nose. We sell a carbon storage bag, we tell you it isolates clean clothing from household smells, and we tell you on the product page to hunt the wind anyway.
Temperature ratings. There is no honest standardised rating for a hunting jacket worn seated in wind. The Sixty Puffy carries an observation — what our testers wore it in, over what layers, sitting still — worded as an observation.
Concealment. No camo pattern claim appears anywhere on this site. We publish fabric noise because it is measurable and we say nothing about pattern because it is not.
Outcomes. Nothing sold here will make an animal walk past you. Gear is the part of a hunt you can control, which is exactly why it is worth measuring — and exactly why measuring it is all we claim to have done.
Questions about a measurement? Ask us — we will send you the raw figures for the run.